Observation of high-frequency vibrational gap modes for KI:Cl- and KI:Br

Strong far-IR impurity-induced gap modes are observed just below the bottom of the optic phonon band in KI: one for $\rm Cl^-$ and the other for $\rm Br^-$. Both of these modes have been predicted using empirical potentials. The agreement between theory and experiment for the two $\rm Cl^-$ modes in...

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Bibliographic Details
Published in:Europhysics letters 1996-04, Vol.34 (1), p.63-68
Main Authors: Grant, A. R, Sievers, A. J, Sangster, M. J. L, Strauch, D
Format: Article
Language:English
Subjects:
63.20.Pw
78.30.-j
78.50.-w
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Summary:Strong far-IR impurity-induced gap modes are observed just below the bottom of the optic phonon band in KI: one for $\rm Cl^-$ and the other for $\rm Br^-$. Both of these modes have been predicted using empirical potentials. The agreement between theory and experiment for the two $\rm Cl^-$ modes indicates that the impurity displacement is dominant for the higher-frequency one but of little importance for the lower-frequency pocket-like gap mode.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i1996-00416-x